> Is this Linux patch series back-ported to older kernels, like the 5.13
kernel that came with my Ubuntu 20.04 installation, or any LTS kernel?
I'm not fully familiar with the Linux kernel release behaviour.

The patches were accepted upstream for kernel 5.18.  Right now it's not been 
added to any official Ubuntu kernel package.
Your options until it's landed:
* There is a PPA that was posted in #12 that has some binary kernels you can 
try.
* You can take binaries from the "mainline" PPA 
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.18-rc2/

Neither of those is a sustainable solution; it's just for checking that
they work for you.

** Also affects: linux-oem-5.17 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.17 (Ubuntu Focal)
       Status: New => Invalid

** Changed in: linux-oem-5.17 (Ubuntu Jammy)
       Status: New => Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1950062

Title:
  Unable to access CPU i2c interfaces with AMD "Cezanne" CPU's

Status in amd:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.14 package in Ubuntu:
  Invalid
Status in linux-oem-5.17 package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Invalid
Status in linux-oem-5.14 source package in Focal:
  Confirmed
Status in linux-oem-5.17 source package in Focal:
  Invalid
Status in linux source package in Jammy:
  Confirmed
Status in linux-oem-5.14 source package in Jammy:
  Invalid
Status in linux-oem-5.17 source package in Jammy:
  Confirmed
Status in Arch Linux:
  New

Bug description:
  OpenRGB uses the CPU SMBus/i2c interfaces to talk to the motherboard
  RGB controller and the DRAM RGB controllers and after updating my
  system to a 5700G from a 2400G I see error messages in dmesg for each
  read and write attempt to the interfaces. If I swap the CPU back on
  the same install I am able to see and control the RGB interfaces.

  Another user on the OpenRGB discord with a 5600G is also seeing the
  same issues.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: linux-image-5.13.0-20-generic 5.13.0-20.20
  ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
  Uname: Linux 5.13.0-20-generic x86_64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  user       1654 F.... pulseaudio
   /dev/snd/pcmC1D0p:   user       1654 F...m pulseaudio
   /dev/snd/controlC0:  user       1654 F.... pulseaudio
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Nov  6 16:36:17 2021
  InstallationDate: Installed on 2021-09-18 (49 days ago)
  InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no username)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-20-generic 
root=UUID=dc2e65cb-a2e0-408c-a64b-bb0ccc6fdef0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.13.0-20-generic N/A
   linux-backports-modules-5.13.0-20-generic  N/A
   linux-firmware                             1.201.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to impish on 2021-10-17 (20 days ago)
  dmi.bios.date: 08/11/2021
  dmi.bios.release: 5.17
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P4.60
  dmi.board.name: B450 Gaming-ITX/ac
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP4.60:bd08/11/2021:br5.17:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:skuToBeFilledByO.E.M.:rvnASRock:rnB450Gaming-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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